00:01
Suppose we have a list of numbers and we want to find the median, the first quartile, the third quartile, and the inner quartile range.
00:09
So to do this by hand, what you need to do is put these numbers in order.
00:14
Because what a median does is it finds the number that's in the middle.
00:18
And the number that's in the middle, well, to do that, you have to have the numbers in order.
00:22
You can't just list the numbers however you want to and say that's the middle number.
00:26
So we have to put them in order.
00:28
I like to start with the lowest number and go up to the highest number.
00:31
So it looks like 75 is the lowest, and then it's 76, and then we have an 84, and then it looks like we have an 85, and then an 87, and then an 88.
00:55
So is that all my 80s, and 70s? looks like all i got left is 90s.
01:02
Now i have a 90, a 91, a 92, a 94, and a 99.
01:14
And when i list this out, i'm going to say, well, i had one, two, three, four, five, six, seven, eight, nine, ten, eleven numbers.
01:24
Do i have eleven numbers? one, two, three, four, five, six, seven, eight, nine, ten, eleven.
01:30
So i have my eleven numbers there.
01:33
So now we want to find the middle number.
01:38
So i have eleven numbers.
01:40
So that means i want to have, if i take eleven and divide it by two, i get five point five.
01:50
So if i go five, five numbers from the left and five numbers from the right, the number in the middle is going to be the middle number.
02:01
So one, two, three, four, five, 88.
02:05
Now look at the other side.
02:07
One, two, three, four, five.
02:09
So i have five numbers over here...